SAP BAPI Connector functions missing

Hi  I am using SAP BAPI Connector to directly connect with on-premise S4HANA 2020. I am able to ready most of BAPI functions but few of them are not readable from explorer page or direct call.    If we create new BAPI function, they are also not readable. is there any specific permission that is missing or some issue with BAPI connector or some other settings? I compared the visible one with new and both have same remote enabled permission.   Appreciate your help. Thanks
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